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Published Date

August 1998


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Introduction to the Design and Maintenance of Cargo System Pressure Relief Valves on Board Gas Carriers

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The book advises on PRV maintenance and testing, emergency closure, and operating problems and faults. It is a general guide for the ship’s staff and is not designed to replace the manufacturers’ instruction manuals.

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This book was written following an incident in 1992 that involved failure of a relief valve when a semi-pressurised LPG carrier was being loaded. The cargo being loaded was propane, and the pressure relief valves PRVs were set to operate at 11 bar gauge. During the final stages of loading at a pressure of 7 bar gauge, one of the pressure relief valves fitted to a cargo tank failed.

 

There were no guidelines available on board or at the terminal to provide any assistance in the emergency methods for closing the valve. The valve was eventually blanked off with the tank pressure reduced to 0.02 bar gauge, but by this time a large amount of the product had been lost into the atmosphere. The investigation that followed discovered that there was a failure of the pilot valve diaphragm, possibly due to the diaphragms being in service for too long.

1. INTRODUCTION

2. REQUIREMENTS FOR PRESSURE RELIEF VALVES

2.1 GENERAL

2.2 VALVE DESIGN REQUIREMENTS

2.3 DESIGN AND INSTALLATION

3. TYPES OF PRESSURE RELIEF VALVES

3.1 PILOT OPERATED VALVES

3.2 SPRING OPERATED PRESSURE RELIEF VALVES

4. PREVENTATIVE AND PLANNED MAINTENANCE PROCEDURES FOR PRESSURE RELIEF VALVES

4.1 SCOPE

4.2 PRESSURE RELIEF VALVE PREVENTATIVE MAINTENANCE PHILOSOPHY

4.3 PRESSURE RELIEF VALVE PREVENTATIVE MAINTENANCE FREQUENCY

4.4 PRESSURE RELIEF VALVE MAINTENANCE AND INSPECTION

4.5 MAINTENANCE AND CARE OF DIAPHRAGMS

4.6 SPARE PARTS

5. EMERGENCY CLOSURE OF PRESSURE RELIEF VALVES

5.1 EMERGENCY CLOSURE

6. OPERATING PROBLEMS AND FAULTS

6.1 OPERATING PROBLEMS

6.2 FAULTS

6.3 CHLORIDE STRESS CORROSION CRACKING

7. IN-SERVICE TESTING

APPENDIX 1 IMO IGC CODE – EXTRACTS FROM CHAPTER 8 CARGO TANK VENT SYSTEMS

APPENDIX 2 DEFINITIONS AND TERMINOLOGY USED IN REGARD TO PRESSURE RELIEF VALVES

APPENDIX 3 METAL TO METAL SEAT VALVES – PRECAUTIONS AND HINTS FOR LAPPING SEATS

APPENDIX 4 PRESSURE LEVELS

APPENDIX 5 FIRE ACTIVATED PRESSURE RELIEF SYSTEMS

REFERENCES

The purpose of SIGTTO is to promote shipping and terminal operations for liquefied gases which are safe, environmentally responsible and reliable. To fulfil this mission it will:

  • Proactively develop best operating practices and guideline

  • Sustain a learning environment by sharing lessons learned

  • Promote training and development of all within the industry

  • Foster mutually beneficial relationships with regulatory authorities and other stakeholders

  • Conduct its business with professionalism and integrity

Title: Introduction to the Design and Maintenance of Cargo System Pressure Relief Valves on Board Gas Carriers
Number of Pages: 35
Product Code: 4400W035
ISBN: ISBN 13: 978-1-85609-163-3 (9781856091633), ISBN 10: 1-85609-163-5 (1856091635)
Published Date: August 1998
Binding Format: Paperback
Weight: 0.20 kg

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